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Foam Box EPS Particles Pre-Expander

New type Vertical EPS Pre expander with high efficiency Vacuum system
Vacuum cooling shortens cycle time significantly
Dual- barrel feeding enables continuous production;
High- precision proportional valves (Burkert / SMC);
Excellent density consistency for multi- weight production;
Designed for high-end EPS block & shape applications.

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Hangzhou Fuyang Dongshan Plastic Machinery Co., Ltd. is one of the most reliable manufacturers and suppliers of foam box eps particles pre-expander in China, also supports customized service with low price. Welcome to wholesale high quality foam box eps particles pre-expander for sale here from our factory. Contact us for pricelist.

Smart Control EPS Resin Pre-Expander with Proportional Valve System for High Density Foam Box

1. Executive Product Overview
The Smart Control EPS Resin Pre-Expander with Proportional Valve System for High Density Foam Box represents the absolute state-of-the-art in advanced thermal processing technology for expandable polystyrene. Specifically engineered for industrial scale conversion, this machinery establishes a highly efficient bridge between raw resin bead preparation and down-stream shape or block moulding systems. By utilizing advanced Proportional Valve System, the machine satisfies the extremely strict density consistency constraints required for manufacturing top-grade High Density Foam Box.
In modern industrial plastic processing, raw bead foaming remains the single most critical stage governing final product performance, material cost overheads, and overall manufacturing reject rates. Dongshan's engineering design approaches this from a total-system perspective-delivering optimized steam fluidization dynamics, structural resilience, and an advanced software architecture that transforms what was traditionally an unpredictable chemical processing stage into a fully predictable, closed-loop industrial science.

product-1280-853

Operational Variable	Industrial Specification Parameter
Machine Architecture Model	Dongshan High-Performance Industrial Series
Core Automation Module	Proportional Valve System
Primary Target Output	Premium Quality High Density Foam Box

Rated Steam Energy Consumption	12 - 15 kg/ton of raw material (Optimized Input)
Volumetric Cycle Output Capacity	Up to 450 - 1200 kg/hour (Based on Target Density)
Density Uniformity Threshold	Standard Deviation ≤ 0.15 g/L across batch testing
Compressed Air Feed Request	0.6 - 0.8 Mpa Operational Pressure

2. Addressing Global Buyer Pain Points
Global manufacturing facilities face severe, compounding operational bottlenecks when utilizing standard, lower-tier prefoaming equipment. Dongshan has engineered this line to systematically eradicate these universal industry challenges:
2.1 Density Fluctuation & Material Waste: Inconsistent steam pressure and inaccurate raw bead dosing lead to extreme density variances. A variance of even 1g/L can result in thousands of dollars in lost profit margins or structural failure in the end-market. Dongshan Solution: Our precision gravimetric dosing paired with micro-second valve control locks variance to within ±1%.
2.2 Exorbitant Energy Overhead: Traditional pre-expanders lose over 35% of thermal energy due to poorly insulated chambers and un-recycled steam venting. Dongshan Solution: Heavy cylindrical chamber insulation combined with integrated thermal recovery cuts direct steam costs drastically.
2.3 Bead Agglomeration & Clogging: High-density or fast-cycling expansion often leads to melted clumps of resin blocking discharge ports, causing extensive downtime. Dongshan Solution: Specialized internal multi-tier fluid agitation systems coupled with immediate fluid-bed stabilization prevents clumping entirely.

Features

Stable density control with ≤ ±1% tolerance;
Closed constant- pressure foaming, suitable for high altitude areas;

High- quality hot air drying system for uniform beads;
International brand components ensure long service life;
Easy operation with PLC & recipe memory Advantages.

Frequency spindle
The spindle rotation speed can be adjusted according to the raw material process, for ensuring that the material leve can control the expanding weight precisely.

Steam system
Adopt relief valve from YOSHITAKE,Japan, with high- precision drainage valve and filter to ensure steam pressure more stable.

Pressure control
International pressure sensor, German BATTON angle- seat valve and multi- valve exhaust system are used to ensure constant temperature and pressure expanding in the bucket, make sure the expanding process more stable and accurate.

Temperature control
The international temperature sensor and German BATTON steam and air dual proportional valve are used to control the temperature, so maintain the precise expanding temperature, for high – density expanding.

Weighing and feeding
Electronic weighing for feeding, and the feeding weight is setup on the touch screen. The weighing device will automatically weigh to achieve accurate feeding.

Material level control
Adopt the vibration sensor from Korea to control expanding material level precisely, ensuring the uniform density of raw material particles.
Material level of fluidizer bed: the height of material level can be adjusted to ensure the aging effect of expanded particles.
Flap feeding device of fluidizer bed ensure the high efficiency of expanding particle feeding .

3. Dongshan Advanced Engineered Solutions & Core Performance
At the center of the machine is the heavy-walled expansion chamber manufactured entirely from SUS304 high-grade
stainless steel to prevent thermal warping and aggressive localized corrosion. The integration of Proportional Valve System
enables complete oversight over the multi-stage swelling cycle. Our proprietary vapor management protocol precisely meters
saturated dry steam, ensuring that each chemical bead receives a uniform thermal dosage from its core to its outer perimeter

Technical Specifications

Item		Unit	DSMAX1100	DSMAX1400	DSMAX1670
Expand Chamber	Chamber	mm	φ1100×1700	φ1400×1800	φ1670×2240
	Volume	m³	1.3	2.7	4.8
	Effective Volume	m³	1	2	3.5
Steam	Inlet	inch	2"(DN50)	2"(DN50)	2.5"(DN65)
	Consumplion	kg/cycle	6-9	8-11	11~14
	Pressure	Mpa	0.5-0.8	0.5-0.8	0.5-0.8
Compressed Air	Inlet	inch	2"(DN50)	2"(DN50)	2"(DN50)
	Consumplion	m³cyce	0.5-0.8	0.6-0.9	0.7-1.1
	Pressure	Mpa	0.5-0.8	0.5-0.8	0.5-0.8
Drainage	Upper Vent	inch	4"(DN100)	5"(DN125)	6'(DN150)
Drainage	Down Vent	inch	4"(DN100)	5"(DN125)	6'(DN150)
Capacity	12g/m³	KG	400	640	960
	16g/m³	KG	500	840	1700
	20g/m³	KG	700	1000	1900
	25g/m³	KG	800	1250	2100
Total Power		KW	21.4	24.9	31.9
Expanding Pipe		mm	φ150	φ200	φ250
Expanding Tolerance(20Kg/m)		%	±2%	±2%	±2.5%
Overall Size(L×W×H)		mm	6400×3800×5200	8300×3300×5700	11000×4000×6000
Weight		KG	3500	5500	6500

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Product Applications

Building Insulation Field

Packaging Industry

Advertising and Decoration Industry

Cold Chain Logistics Field

Other Fields

Application

Why Choose Us

What We Can Do For You

At DONGSHAN EPS EPP MACHINERY, we are more than just a machine supplier - we are your long-term production partner.

With over 30 years of experience in the EPS and EPP industry, we provide complete solutions designed to help customers improve production efficiency, reduce operating costs, and achieve stable long-term business growth.

Complete Turnkey EPS & EPP Factory Solutions

From factory layout planning to machine installation and production support, we provide one-stop turnkey solutions tailored to your production needs.

High-Quality & Reliable Machinery

We manufacture advanced EPS and EPP machines with strong structures, premium configurations, intelligent control systems, and stable long-term performance.

Improve Your Production Efficiency

Our high-performance machines help customers increase output, shorten production cycles, and improve overall factory productivity.

Reduce Your Production Costs

Through energy-saving technology and optimized system design, our machines help reduce steam consumption, power usage, and labor costs.

Fully Automatic Smart Production

DONGSHAN machines feature advanced PLC automation systems for easier operation, stable production control, and intelligent factory management.

Professional Technical Support

Our experienced engineering team provides installation guidance, operator training, technical consultation, and fast after-sales service support.

Customized Solutions for Different Markets

We understand that every customer has different production requirements. DONGSHAN can customize machine configurations and production solutions based on your products, capacity, and market demands.

Long-Term Cooperation & Service

We focus not only on selling machines, but also on building long-term partnerships by helping customers continuously improve production performance and market competitiveness.

DONGSHAN EPS EPP MACHINERY - Helping You Build a More Efficient, Profitable, and Intelligent EPS Production Future.